The first 4-chloro-1,3-bis(trimethylsilyloxy)-1,3-diene and its application to the regioselective synthesis of chlorinated arenes

Chlorinated phenols, benzophenones, and butenolides are prepared by various one-pot cyclization reactions of the first 4-chloro-1,3-bis(trimethylsilyloxy)-1,3-butadiene.